@urbanmicrofarmer @compost I know that using manure from cows that eat hay treated with dicamba and similar herbicides would be bad. I saw on an extension service site that if legumes can grow in it, it would indicate that it's clear of that one. There's also the issue of any meds fed to the cows. If you can raise chickens, that's great.
@Bon_Jardin @compost I have a garden plot on the edge of town. The land owner says he will bring in the composted cow manure for his use and mine, if interested. Since I don’t know the source, I will decline. At my backyard / home garden I have laying hens. I know what they eat, and I’m glad to get their manure. Today I connected with the local microbrewery. I now have a source of spent brewing grains (free)!